slatt

As nouns the difference between slate and slatt

is that slate is a fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers while slatt is a stone slab used as a veneer for coarse masonry.

As an adjective slate

is having the bluish-grey/gray colour/color of slate.

As a verb slate

is to cover with slate.